CALIFORNIA WATER
 SERVICE GROUP
     LOGO                           NEWS RELEASE
                           CALIFORNIA WATER SERVICE GROUP


             1720 North First Street
             San Jose, CA 95112-4598                            January 26, 2005
                                                           For Immediate Release

Contact:     Richard Nye  (408) 367-8216 (analysts)
             Shannon Dean (310) 257-1435 (media)

                   COMPANY ANNOUNCES 4TH QUARTER 2004 RESULTS
                           AND TOTAL YEAR 2004 RESULTS
                                     -------
                 BOARD DECLARES 60TH CONSECUTIVE ANNUAL DIVIDEND

- --------------------------------------------------------------------------------

SAN JOSE,  CA -  California  Water  Service  Group (NYSE : CWT) today  announced
diluted  earnings  per share of $0.20 for the 4th  quarter of 2004  compared  to
$0.41 for the same period  last year.  Fourth  quarter  2004 net income was $3.7
million, compared to $7.0 million in the fourth quarter of 2003. Primary factors
contributing to the decrease were lower gains from property  sales,  weather and
additional shares outstanding.

         Revenue for the quarter decreased slightly to $69.4 million, a decrease
of  $0.2  million  or  less  than  1%.  Usage  by  existing   customers  dropped
significantly  due to weather,  decreasing  revenue by $4.3  million.  Partially
offsetting  the decrease in sales was $0.8 million in revenues from sales to new
customers and $3.3 million in revenues from authorized rate increases.

         Operating  expenses for the quarter were $61.9  million,  a decrease of
$0.2  million  or less  than 1% over the same  period  last  year.  Lower  water
production  costs and lower income  taxes were offset by  increased  expenses in
several other categories, including payroll, benefits, legal, Sarbanes-Oxley Act
compliance, and depreciation.



         Other  income  was lower,  as the  Company  had no gains  from  surplus
property sales in the fourth  quarter,  compared to pretax gains of $3.1 million
in the fourth quarter of 2003.

          "Company-wide,  we understand the importance of operating efficiently.
However,  certain costs were incurred to ensure that we fulfill our  obligations
to our employees,  comply with all laws and regulations,  and provide  customers
with the quality and service they expect.  That said, we will continue to pursue
rate relief that  reflects  the higher costs of  providing  high  quality  water
utility  services  to ensure that our  stockholders  earn a fair return on their
investment," said President and Chief Executive Officer Peter C. Nelson.

         The Company  received  approval to increase rates on an annual basis by
$4.1 million for step rate  increases  effective in January  2005.  Also, in the
past three months, the Company received approval to collect $9.2 million related
to balancing  accounts.  The collection  periods vary by district and range from
one to three years.  Pending  applications  to the California  Public  Utilities
Commission  (CPUC)  include 2004 general  rate case  filings  totaling  over $26
million for eight  districts  and  corporate  headquarters.  The Company  cannot
predict  the final  amount or the  timing of the  CPUC's  decisions  on  pending
filings.

         Another  regulatory matter of note is the treatment of gains from sales
of surplus  properties.  In 1995, the California  Legislature  enacted the Water
Utility  Infrastructure  Improvement  Act of 1995 (the Act) to  encourage  water
utilities to sell surplus properties no longer useful in providing water service
and to reinvest the proceeds of the sales in needed  water  utility  facilities.



The Office of Ratepayer  Advocates (ORA), a division of the CPUC responsible for
representing  the interests of ratepayers,  issued a report on January 11, 2005,
expressing  its opinion that the Company had not proven that surplus  properties
sold since 1996 were no longer used and useful,  and  challenging  the Company's
treatment of the gains from those  sales.  ORA  recommended  that the Company be
fined  $160,000 and that an  unspecified  portion of the $19.2  million in gains
from sales be allocated for the benefit of ratepayers.  The Company  believes it
has fully complied with the Act and that ORA's  conclusions and  recommendations
are without merit.  Accordingly,  the Company intends to vigorously oppose ORA's
report and no liability has been accrued in the financial  statements  for ORA's
recommendations.  Because  ORA's  recommendations  are not binding,  the Company
cannot predict how the CPUC will rule on this matter.

2004 Results

         For the year,  net income  increased  $6.6 million to $26.0 million and
diluted  earnings per share increased  $0.25 to $1.46.  Annual  revenues,  which
increased 14% to $315.6 million,  were boosted by $29.8 million from rate relief
granted by the CPUC, $5.4 million from sales to new customers,  and $3.2 million
from increased sales to existing customers.

         Total operating expenses  increased to $274.1 million,  or 11%, for the
year. The Company incurred higher wholesale water rates and purchased more water
in 2004;  as a result,  water costs  increased  by $9 million.  Other  operating
increases  were  primarily in income taxes,  payroll and benefit  costs,  legal,
Sarbanes-Oxley Act compliance and depreciation expense.



         In 2004, there were minimal gains from surplus property sales, compared
to $4.6 million in pretax gains from surplus property sales in 2003.

         According to Nelson,  the Company continued to see the positive effects
of  rate  relief  as  the  CPUC  issued  several   decisions  on  the  Company's
applications during the year.

         "Last year was a mixed bag as far as weather is  concerned;  dry,  warm
weather  increased sales in the second  quarter,  while  record-breaking  storms
reduced sales in the fourth quarter.  What has remained  constant is our pursuit
of fair and timely rate relief in all of our operating districts," Nelson said.

Dividend Information

         At their meeting yesterday,  Directors increased the quarterly dividend
on common stock from $0.2825 to $0.2850,  which marks the 38th  consecutive year
the Company's  dividend has been increased.  It is payable on February 18, 2005,
to stockholders of record on February 7, 2005. The regular  dividend on Series C
preferred stock was also declared.

Other Information

         On Thursday,  January 27, 2005, at 1 p.m. Pacific Standard Time (4 p.m.
Eastern Standard Time), the Company will conduct a teleconference call, at which
time  management  will provide  comments  about fourth quarter and year-end 2004
operating  results and other  pertinent  matters.  Any stockholder or interested
investor can listen to the  teleconference  or a replay.  The dial-in  number to
access  the  teleconference  is  1-866-814-1917,  call  ID  #620290.  Additional
information about the call,  including replay  information,  is available at the
Company's web site, at www.calwatergroup.com.



         California  Water  Service  Group is the parent  company of  California
Water  Service  Company,  Washington  Water  Service  Company,  New Mexico Water
Service Company,  Hawaii Water Service Company,  Inc. and CWS Utility  Services.
Together these companies provide  regulated and  non-regulated  water service to
over 2 million people in 100 communities in California,  Washington,  New Mexico
and Hawaii. Group's common stock trades on the New York Stock Exchange under the
symbol "CWT."

         This  news  release  contains  forward-looking  statements  within  the
meaning  established  by the Private  Securities  Litigation  Reform Act of 1995
("Act"). The forward-looking statements are intended to qualify under provisions
of the federal  securities laws for "safe harbor"  treatment  established by the
Act.  Forward-looking  statements are based on currently available  information,
expectations,  estimates, assumptions and projections, and management's judgment
about the Company,  the water utility industry and general economic  conditions.
Such  words  as  expects,   intends,   plans,  believes,   estimates,   assumes,
anticipates,  projects,  predicts,  forecasts  or  variations  of such  words or
similar  expressions are intended to identify  forward-looking  statements.  The
forward-looking  statements are not guarantees of future  performance.  They are
subject to  uncertainty  and changes in  circumstances.  Actual results may vary
materially from what is contained in a forward-looking  statement.  Factors that
may cause a result different than expected or anticipated include:  governmental
and regulatory commissions' decisions, including decisions on proper disposition
of property;  changes in regulatory  commissions'  policies and procedures;  the
timeliness  of  regulatory  commissions'  actions  concerning  rate relief;  new
legislation ;the ability to satisfy requirements  relating to the Sarbanes-Oxley
Act on and other regulation on internal control;  electric power  interruptions;
increases in suppliers' prices and the availability of supplies  including water
and power;  fluctuations in interest rates; changes in environmental  compliance
and water quality  requirements;  acquisitions  and our ability to  successfully
integrate  acquired  companies;  the ability to successfully  implement business
plans;  changes in customer  water use patterns;  the impact of weather on water
sales and operating results; access to sufficient capital on satisfactory terms;
civil  disturbances  or terrorist  threats or acts,  or  apprehension  about the
possible future  occurrences of acts of this type; the involvement of the United
States in war or other hostilities;  restrictive  covenants in or changes to the
credit  ratings on our current or future debt that could  increase our financing
costs or affect our ability to borrow,  make payments on debt or pay  dividends;
and,  other  risks  and  unforeseen  events.  When  considering  forward-looking
statements,  you should keep in mind the cautionary  statements included in this
paragraph.  The  Company  assumes no  obligation  to provide  public  updates of
forward-looking statements.

          Additional   information   is   available   at   our   Web   site   at
          www.calwatergroup.com.

          Attachments (3).

                                      ###




CALIFORNIA WATER SERVICE GROUP
CONDENSED CONSOLIDATED BALANCE SHEET
Unaudited
(In thousands, except per share data)

                                                   December 31,    December 31,
                                                       2004            2003
                                                       ----            ----
ASSETS
Utility plant:
    Utility plant                                  $ 1,144,074      $ 1,078,975
    Less accumulated depreciation and
     amortization                                      343,769          319,477
                                                   -----------      -----------
        Net utility plant                              800,305          759,498
                                                   -----------      -----------

Current assets:
    Cash and cash equivalents                           18,820            2,856
    Customer receivables                                15,867           18,434
    Other receivables                                   10,445            5,125
    Unbilled revenue                                     9,307            8,522
    Materials and supplies                               3,161            2,957
    Taxes and other prepaid expenses                    12,793            5,609
                                                   -----------      -----------
        Total current assets                            70,393           43,503
                                                   -----------      -----------

Regulatory assets                                       53,477           53,326
Other assets                                            18,678           16,708
                                                   -----------      -----------
                                                   $   942,853      $   873,035
                                                   ===========      ===========

CAPITALIZATION AND LIABILITIES
Capitalization:
    Common stock, $.01 par value                   $       184      $       169
    Additional paid-in capital                         131,271           93,748
    Retained earnings                                  156,851          150,908
    Accumulated other comprehensive loss                  (701)            (301)
                                                   -----------      -----------
        Total common stockholders' equity              287,605          244,524
    Preferred stock                                      3,475            3,475
    Long-term debt, less current maturities            274,821          272,226
                                                   -----------      -----------
        Total capitalization                           565,901          520,225
                                                   -----------      -----------

Current liabilities:
    Current maturities of long-term debt                 1,100              904
    Short-term borrowings                                   --            6,454
    Accounts payable                                    19,745           23,776
    Accrued expenses and other liabilities              36,367           32,430
                                                   -----------      -----------
        Total current liabilities                       57,212           63,564

Unamortized investment tax credits                       2,721            2,925
Deferred income taxes                                   54,826           38,005
Regulatory liabilities                                  18,811           16,676
Advances for construction                              131,292          121,952
Contributions in aid of construction                    94,915           90,529
Other long-term liabilities                             17,175           19,159
                                                   -----------      -----------
                                                   $   942,853      $   873,035
                                                   ===========      ===========




CALIFORNIA WATER SERVICE GROUP
CONDENSED CONSOLIDATED STATEMENT OF INCOME
Unaudited
(In thousands, except per share data)


For the three months ended:                        December 31,    December 31,
                                                       2004            2003
                                                       ----            ----

Operating revenue                                    $ 69,378       $ 69,626
                                                     --------       --------
Operating expenses:
    Operations                                         46,746         45,618
    Maintenance                                         3,375          3,229
    Depreciation and amortization                       6,557          5,828
    Income taxes                                        2,232          4,550
    Property and other taxes                            2,957          2,860
                                                     --------       --------
        Total operating expenses                       61,867         62,085
                                                     --------       --------

        Net operating income                            7,511          7,541
                                                     --------       --------

Other income and expenses:
    Non-regulated income, net                             602            305
    Gain on sale of non-utility property                    1          3,068
                                                     --------       --------
        Total other income and expenses                   603          3,373
                                                     --------       --------

Interest expense:
    Interest expense                                    4,651          4,686
    Less capitalized interest                             274            785
                                                     --------       --------
        Total interest expense                          4,377          3,901
                                                     --------       --------

Net income                                           $  3,737       $  7,013
                                                     ========       ========
Earnings per share
    Basic                                            $   0.20       $   0.41
                                                     ========       ========
    Diluted                                          $   0.20       $   0.41
                                                     ========       ========
Weighted average shares outstanding
    Basic                                              18,350         16,932
                                                     ========       ========
    Diluted                                            18,380         16,944
                                                     ========       ========
Dividends per share of common stock                  $0.28250       $0.28125
                                                     ========       ========




CALIFORNIA WATER SERVICE GROUP
CONDENSED CONSOLIDATED STATEMENT OF INCOME
Unaudited
(In thousands, except per share data)


For the twelve months ended:                        December 31,    December 31,
                                                       2004            2003
                                                       ----            ----

Operating revenue                                    $315,567       $277,128
                                                     --------       --------
Operating expenses:
    Operations                                        206,150        187,469
    Maintenance                                        13,228         12,717
    Depreciation and amortization                      26,114         23,256
    Income taxes                                       17,084         12,898
    Property and other taxes                           11,508         10,554
                                                     --------       --------
        Total operating expenses                      274,084        246,894
                                                     --------       --------

        Net operating income                           41,483         30,234
                                                     --------       --------

Other income and expenses:
    Non-regulated income, net                           2,375          2,097
    Gain on sale of non-utility property                    8          4,603
                                                     --------       --------
        Total other income and expenses                 2,383          6,700
                                                     --------       --------

Interest expense:
    Interest expense                                   18,664         19,512
    Less capitalized interest                             824          1,995
                                                     --------       --------
        Total interest expense                         17,840         17,517
                                                     --------       --------

Net income                                           $ 26,026       $ 19,417
                                                     ========       ========
Earnings per share
    Basic                                            $   1.46        $  1.21
                                                     ========       ========
    Diluted                                          $   1.46        $  1.21
                                                     ========       ========
Weighted average shares outstanding
    Basic                                              17,652         15,882
                                                     ========       ========
    Diluted                                            17,674         15,893
                                                     ========       ========
Dividends per share of common stock                  $1.13000       $1.12500
                                                     ========       ========